package com.nj.liandi.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.nj.liandi.common.utils.R;
import com.nj.liandi.gulimall.search.feign.ProductFeignService;
import com.nj.liandi.gulimall.search.interceptor.CartInterceptor;
import com.nj.liandi.gulimall.search.service.CartService;
import com.nj.liandi.gulimall.search.to.UserInfoTo;
import com.nj.liandi.gulimall.search.vo.Cart;
import com.nj.liandi.gulimall.search.vo.CartItem;
import com.nj.liandi.gulimall.search.vo.SkuInfoVo;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.stream.Collectors;

@Service
public class CartServiceImpl implements CartService {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    ThreadPoolExecutor executor;

    private final static String  CART_PREFIX="gulimall:cart:";

    @Override
    public CartItem addToCart(Long skuId, Integer num) throws ExecutionException, InterruptedException {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        String res = (String) cartOps.get(skuId.toString());
        if (StringUtils.isEmpty(res)) {
            CartItem cartItem = new CartItem();
            CompletableFuture<Void> getSkuInfo = CompletableFuture.runAsync(() -> {
                //远程查询当前需要添加的商品的信息
                R r = productFeignService.getSkuInfo(skuId);
                SkuInfoVo skuInfo = r.getData("skuInfo", new TypeReference<SkuInfoVo>() {
                });
                cartItem.setCheck(true);
                cartItem.setCount(num);
                cartItem.setImage(skuInfo.getSkuDefaultImg());
                cartItem.setSkuId(skuId);
                cartItem.setPrice(skuInfo.getPrice());
                cartItem.setTitle(skuInfo.getSkuTitle());
            },executor);

            CompletableFuture<Void> getSkuSaleAttrValues = CompletableFuture.runAsync(() -> {
                //远程查询sku组合信息
                List<String> skuSaleAttrValues = productFeignService.getSkuSaleAttrValues(skuId);
                cartItem.setSkuAttr(skuSaleAttrValues);
            }, executor);
            CompletableFuture.allOf(getSkuInfo,getSkuSaleAttrValues).get();
            String s = JSON.toJSONString(cartItem);
            cartOps.put(skuId.toString(),s);
            return cartItem;
        }else {
            CartItem cartItem = JSON.parseObject(res,CartItem.class);
            cartItem.setCount(num+cartItem.getCount());
            cartOps.put(skuId.toString(),JSON.toJSONString(cartItem));
            return cartItem;
        }
    }

    @Override
    public CartItem getCartItem(Long skuId) {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        String str = (String) cartOps.get(skuId.toString());
        CartItem cartItem = JSON.parseObject(str, CartItem.class);
        return cartItem;
    }

    @Override
    public Cart getCart() throws ExecutionException, InterruptedException {
        Cart cart = new Cart();
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        //判断是否是登录状态
        if (userInfoTo.getUserId()!=null) {
            String cartKey =CART_PREFIX+userInfoTo.getUserId();
            String tempCartKey = CART_PREFIX + userInfoTo.getUserKey();
            List<CartItem> tempCartItems = getCartItems(tempCartKey);
            if (tempCartItems!=null) {
                //临时购物车有数据,就合并过来
                for (CartItem item : tempCartItems) {
                    addToCart(item.getSkuId(),item.getCount());
                }
                //清楚临时购物车的数据
                clearCart(tempCartKey);
            }
            //获取登录后的购物车数据(包含已经合并过来的临时购物车数据)
            List<CartItem> cartItems = getCartItems(cartKey);
            cart.setItems(cartItems);
        }else {
            String cartKey =CART_PREFIX+userInfoTo.getUserKey();
            List<CartItem> cartItems = getCartItems(cartKey);
            cart.setItems(cartItems);
        }
        return cart;
    }

    @Override
    public void clearCart(String cartKey) {
        redisTemplate.delete(cartKey);
    }

    @Override
    public void ckeckItem(Long skuId, Integer check) {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        CartItem cartItem = getCartItem(skuId);
        cartItem.setCheck(check==1?true:false);
        String s = JSON.toJSONString(cartItem);
        cartOps.put(skuId.toString(),s);
    }

    @Override
    public void changeItemCount(Long skuId, Integer num) {
        CartItem cartItem = getCartItem(skuId);
        cartItem.setCount(num);
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        cartOps.put(skuId.toString(),JSON.toJSONString(cartItem));
    }

    @Override
    public void deleteItem(Long skuId) {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        cartOps.delete(skuId.toString());
    }

    @Override
    public List<CartItem> getUserCartItems() {
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        if (userInfoTo.getUserId()==null) {
            return null;
        }else {
            String cartKey = CART_PREFIX +userInfoTo.getUserId();
            List<CartItem> cartItems = getCartItems(cartKey);
            //获取所有被选中的购物项
            List<CartItem> collect = cartItems.stream().filter(item -> item.getCheck()).map(item -> {
                R r = productFeignService.getPrice(item.getSkuId());
                String data = (String) r.get("data");
                item.setPrice(new BigDecimal(data));
                return item;
            }).collect(Collectors.toList());
            return collect;
        }
    }

    private BoundHashOperations<String, Object, Object> getCartOps() {
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        String cartKey ="";
        if (userInfoTo.getUserId()!=null) {
            cartKey = CART_PREFIX +userInfoTo.getUserId();
        }else {
            cartKey =CART_PREFIX +userInfoTo.getUserKey();
        }
        BoundHashOperations<String, Object, Object> operations = redisTemplate.boundHashOps(cartKey);
        return operations;
    }

    private List<CartItem> getCartItems(String cartKey){
        BoundHashOperations<String, Object, Object> hashOps = redisTemplate.boundHashOps(cartKey);
        List<Object> values = hashOps.values();
        if (values!=null&&values.size()>0) {
            List<CartItem> collect = values.stream().map(item -> {
                String str = (String) item;
                CartItem cartItem = JSON.parseObject(str, CartItem.class);
                return cartItem;
            }).collect(Collectors.toList());
            return collect;
        }
        return null;
    }
}
